Re: Asteroids and Deluxe PCB problems

Update... this only happens in the demo mode. I coined up the game and the
dot and line go away in game mode and It goes away in self test. In the demo
mode I get a bright dot in the center and a line off to the right top
corner. Everything else looks okay in demo accept the dot and line ... This
is making me pull my hair out...
almost seems to be a rom or something in either the Z or Scale circuit. I
see it on my scope with just the x and y inputs though. What the heck????

----- Original Message -----
From: "Jilayne Stanclif" <jstancliff@mchsi.com>
To: <vectorlist@synthcom.com>
Sent: Saturday, June 29, 2002 1:15 PM
Subject: Re: VECTOR: Asteroids and Deluxe PCB problems

> Okay,
>
> Now heres a weird one. On the Asteriods Deluxe, I've got it up and
running.
> Everything looks good but it has a very bright dot in the center and a
line
> from it that runs up to the right corner?? Self test does no do this only
in
> game mode. I checked all roms in my eprom programmer with good bins and
they
> check out fine.
>
> I changed all the 74ls191 in the y axis along with all the 157's
because
> they all were getting about 150 degrees.
>
> Any idea on the line with the bright spot?? I know its not the monitor
> or roms.
>
> Thanks,
>
> Fred
>
>
>
> ----- Original Message -----
> From: "Bryan Kruzynski" <tron@voyager.net>
> To: <vectorlist@synthcom.com>
> Sent: Friday, June 28, 2002 10:10 PM
> Subject: Re: VECTOR: Asteroids and Deluxe PCB problems
>
>
> > > Got ahold of an Asteriods cocktail today with an extra deluxe PCB.
> > > Both PCB's have problems. The asteriods continues to reset with 2
> > > diagonal lines through the test screen. Any idea's on this? Maybe
> > > a divide clock chip? or should I start with the roms? They are the
> > > Prom types. What eprom replaces these anyone know? I reseated all
> > > chips with nothing changing. The deluxe displays nothing, but
> > > gives a series of beeps. It's beep beep booop or * * - over and
> > > over again. Do the deluxe's have beep codes or is this a strange
> > > byproduct of the board having a bizarre problem.
> >
> > The Asteroids repair encyclopedia is always a good starting point.
> >
> > http://www.ionpool.net/arcade/asteroidtech/asteroidsrepair.html
> >
>
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Received on Sat Jun 29 14:03:07 2002